设G是一个图,a,b,n是正整数且1≤a≤b,n≥0.定义了分数(a,b;n)-临界图,并给出了G是分数(a,b;n)-临界图的与孤立韧度有关的充分条件.
let G be a graph, a, b, n be positive integers and 1 ≤ a ≤ b, n ≥0. Fractional ( a, b ; n)-critical graph is detined and the sufficient condition related to isolated toughness for a graph to be a fractional ( a, b ; n)-critical graph is obtained.